Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 388,105	$ 428,585
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	400,000,000	400,000,000
Common Stock, shares issued	52,130,744	52,177,352
Common Stock, shares outstanding	28,810,883	30,358,509
Treasury stock, shares	22,489,443	20,982,812